Dropbox has announced through an email to users on older versions of OS X that it will soon be discontinuing support for computers running Leopard or other older versions of the operating system. Users still running anything older than OS X 10.6 will need to upgrade in order to continue using future versions of the Dropbox app.

Users who don’t upgrade will still be able to use the web-based Dropbox manager, but will be automatically signed out of the Mac app. From that point forward, they will not be able to login back into the Mac client until they are on a newer version of OS X.

The changes will go into effect on May 18th, so users still have plenty of time to upgrade their software (or hardware, if necessary). The full email is included below:

Hi,

We noticed that you’re running the Dropbox desktop application (client) on an older operating system (OS X Tiger 10.4 or OS X Leopard 10.5). We’re writing to let you know that as of May 18th, Dropbox will no longer support these older versions of OS X.

Don’t worry — your files and photos aren’t going anywhere! But you’ll need to update your computer to OS X Snow Leopard 10.6 or later to access them through the Dropbox desktop app. Apple’s instructions on how to update your operating system can be found here.

If you don’t want to update your operating system, your files will still be available through the Dropbox website. However, on May 18th you’ll be signed out of your Dropbox account on your computer and the Dropbox desktop application will no longer be accessible.

We apologize for the inconvenience. For more information, please check out our Help Center.